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# -*- coding: utf-8 -*- |
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from __future__ import division, absolute_import, unicode_literals |
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import datetime as dt |
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import numpy as np |
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import pytest |
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from numpy.testing import assert_allclose |
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from apexpy import helpers |
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# ---------------------------------------------------------------------------- |
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# NOTE: whenever function outputs are tested against hard-coded numbers, the |
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# test results (numbers) were obtained by running the code that is tested. |
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# Therefore these tests below only check that nothing changes when refactoring, |
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# etc., and not if the results are actually correct |
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# ---------------------------------------------------------------------------- |
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# ============================================================================ |
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# Test checklat |
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# ============================================================================ |
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@pytest.mark.parametrize('lat', [(90), (0), (-90), (np.nan)]) |
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def test_checklat_scalar(lat): |
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"""Test good latitude check with scalars.""" |
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if np.isnan(lat): |
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assert np.isnan(helpers.checklat(lat)) |
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else: |
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assert helpers.checklat(lat) == lat |
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@pytest.mark.parametrize('lat', [(90 + 1e-5), (-90 - 1e-5)]) |
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def test_checklat_scalar_clip(lat): |
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"""Test good latitude check with scalars just beyond the lat limits.""" |
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assert helpers.checklat(lat) == np.sign(lat) * np.floor(abs(lat)) |
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@pytest.mark.parametrize('in_args,msg', |
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[([90 + 1e-4], "lat must be in"), |
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([-90 - 1e-4, 'glat'], "glat must be in"), |
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([[-90 - 1e-5, -90, 0, 90, 90 + 1e-4], 'glat'], |
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"glat must be in"), |
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([[-90 - 1e-4, -90, np.nan, np.nan, 90 + 1e-5]], |
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'lat must be in')]) |
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def test_checklat_error(in_args, msg): |
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"""Test bad latitude raises ValueError with appropriate message.""" |
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with pytest.raises(ValueError) as verr: |
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helpers.checklat(*in_args) |
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assert str(verr.value).startswith(msg) |
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def test_checklat_array(): |
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"""Test good latitude with finite values.""" |
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assert_allclose(helpers.checklat([-90 - 1e-5, -90, 0, 90, 90 + 1e-5]), |
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np.array([-90, -90, 0, 90, 90]), rtol=0, atol=1e-8) |
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return |
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def test_checklat_array_withnan(): |
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"""Test good latitude input mixed with NaNs.""" |
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in_lat = np.array([-90 - 1e-5, -90, 0, 90, 90 + 1e-5, np.nan, np.nan]) |
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fin_mask = np.isfinite(in_lat) |
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out_lat = helpers.checklat(in_lat) |
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assert_allclose(np.array([-90, -90, 0, 90, 90]), out_lat[fin_mask], |
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rtol=0, atol=1e-8) |
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assert np.all(np.isnan(out_lat[~fin_mask])) |
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# ============================================================================ |
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# Test getsinIm |
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# ============================================================================ |
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def test_getsinIm_scalar(): |
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assert_allclose(helpers.getsinIm(60), 0.96076892283052284) |
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assert_allclose(helpers.getsinIm(10), 0.33257924500670238) |
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assert type(helpers.getsinIm(60)) != np.ndarray |
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def test_getsinIm_1Darray(): |
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assert_allclose(helpers.getsinIm([60, 10]), |
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[0.96076892283052284, 0.33257924500670238]) |
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def test_getsinIm_2Darray(): |
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assert_allclose(helpers.getsinIm([[60, 10], [60, 10]]), |
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[[0.96076892283052284, 0.33257924500670238], |
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[0.96076892283052284, 0.33257924500670238]]) |
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# ============================================================================ |
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# Test getcosIm |
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# ============================================================================ |
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def test_getcosIm_scalar(): |
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assert_allclose(helpers.getcosIm(60), 0.27735009811261463) |
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assert_allclose(helpers.getcosIm(10), 0.94307531289434765) |
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assert type(helpers.getcosIm(60)) != np.ndarray |
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def test_getcosIm_1Darray(): |
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assert_allclose(helpers.getcosIm([60, 10]), |
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[0.27735009811261463, 0.94307531289434765]) |
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def test_getcosIm_2Darray(): |
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assert_allclose(helpers.getcosIm([[60, 10], [60, 10]]), |
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[[0.27735009811261463, 0.94307531289434765], |
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[0.27735009811261463, 0.94307531289434765]]) |
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# ============================================================================ |
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# Test toYearFraction |
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# ============================================================================ |
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def test_toYearFraction(): |
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assert_allclose(helpers.toYearFraction(dt.datetime(2001, 1, 1, 0, 0, 0)), |
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2001) |
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assert_allclose(helpers.toYearFraction(dt.date(2001, 1, 1)), 2001) |
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assert_allclose(helpers.toYearFraction(dt.datetime(2002, 1, 1, 0, 0, 0)), |
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2002) |
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assert_allclose(helpers.toYearFraction(dt.datetime(2005, 2, 3, 4, 5, 6)), |
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2005.090877283105) |
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assert_allclose(helpers.toYearFraction(dt.datetime(2005, 12, 11, 10, 9, 8)), |
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2005.943624682902) |
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# ============================================================================ |
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# Test gc2gdlat |
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# ============================================================================ |
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def test_gc2gdlat(): |
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assert_allclose(helpers.gc2gdlat(0), 0) |
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assert_allclose(helpers.gc2gdlat(90), 90) |
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assert_allclose(helpers.gc2gdlat(30), 30.166923849507356) |
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assert_allclose(helpers.gc2gdlat(60), 60.166364190170931) |
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# ============================================================================ |
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# Test subsol |
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# ============================================================================ |
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def test_subsol(): |
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assert_allclose(helpers.subsol(dt.datetime(2005, 2, 3, 4, 5, 6)), |
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(-16.505391672592904, 122.17768157084515)) |
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assert_allclose(helpers.subsol(dt.datetime(2010, 12, 11, 10, 9, 8)), |
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(-23.001554595838947, 26.008999999955023)) |
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with pytest.raises(ValueError): |
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helpers.subsol(dt.datetime(1600, 12, 31, 23, 59, 59)) |
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assert_allclose(helpers.subsol(dt.datetime(1601, 1, 1, 0, 0, 0)), |
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(-23.06239721771427, -178.90131731228584)) |
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with pytest.raises(ValueError): |
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helpers.subsol(dt.datetime(2101, 1, 1, 0, 0, 0)) |
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assert_allclose(helpers.subsol(dt.datetime(2100, 12, 31, 23, 59, 59)), |
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(-23.021061422069053, -179.23129780639425)) |
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def datetime64_to_datetime(dt64): |
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"""Convert numpy datetime64 object to a datetime datetime object. |
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Notes |
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----- |
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Works outside 32 bit int second range of 1970 |
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""" |
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year_floor = dt64.astype('datetime64[Y]') |
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month_floor = dt64.astype('datetime64[M]') |
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day_floor = dt64.astype('datetime64[D]') |
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year = year_floor.astype(int) + 1970 |
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month = (month_floor - year_floor).astype('timedelta64[M]').astype(int) + 1 |
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day = (day_floor - month_floor).astype('timedelta64[D]').astype(int) + 1 |
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return dt.datetime(year, month, day) |
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def test_subsol_array(): |
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"""Verify subsolar point calculation using an array of np.datetime64. |
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Notes |
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----- |
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Tested by ensuring the array of np.datetime64 is equivalent to converting |
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using single dt.datetime values |
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""" |
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dates = np.arange(np.datetime64("1601"), np.datetime64("2100"), |
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np.timedelta64(100, 'D')).astype('datetime64[s]') |
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sslat, sslon = helpers.subsol(dates) |
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for i, date in enumerate(dates): |
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datetime = datetime64_to_datetime(date) |
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true_sslat, true_sslon = helpers.subsol(datetime) |
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assert sslat[i] == true_sslat |
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assert sslon[i] == true_sslon |
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if __name__ == '__main__': |
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pytest.main() |
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aburrell /
apexpy
